JP2009186152A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively improve heat efficiency by uniformly heating a bottom surface of a cooking pan. <P>SOLUTION: In a gas cooking stove 1, a combustion area 10, which has a circular shape in a plane view and includes a plurality of angled flame holes 15 at its outer periphery for circulating a combustion gas, is formed in a recessed state on a top panel 3 of a device body 2 on which the cooking pan P is placed. Each angled flame hole 15 is formed in a state of being inclined at a prescribed angle from the radial direction toward the circumferential direction side of the combustion area 10 so that the combustion gas flows to the center while swirling in the combustion area 10. Further, a combustion gas exhaust passage 17 is formed on a central portion of the combustion area 10 for guiding the combustion gas downward to be exhausted to the outside of the combustion area 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cooking device such as a gas stove.

  For example, in the gas stove, as disclosed in Patent Documents 1 to 3, a burner with a flame hole facing inward is disposed at the center, while a cylindrical virtues for placing a cooking container such as a pan is provided above the burner, A structure has been proposed in which an exhaust window is opened on the inner peripheral wall of Gotoku, and an exhaust fan is provided in the combustion gas exhaust path communicating with the space in Gotoku. According to this structure, the combustion gas of the burner moves in the radial direction from the center of the cooking vessel, is sucked from the exhaust window, and is forcibly exhausted. Therefore, by contacting the bottom of the cooking container until just before being sucked into the exhaust window, high thermal efficiency can be obtained as compared with the conventional one using the five virtues where the lower part of the cooking container is opened.

Japanese Patent No. 3688384 Japanese Patent No. 3710103 Japanese Patent No. 3712463

  However, even if the lower part of the cooking container is closed in this way, the combustion gas spreads radially to the outer periphery of the cooking container and is discharged, so that the exhaust resistance becomes smaller and the heat tends to diffuse toward the outer peripheral side of the cooking container. . Therefore, heating unevenness occurred on the bottom surface of the cooking container, and sufficient thermal efficiency was not improved.

  Then, this invention aims at providing the heating cooker which can heat the bottom face of a cooking container uniformly, and can improve thermal efficiency effectively.

In order to achieve the above object, the invention according to claim 1 is a plane in which a plurality of flame holes are provided on the inner peripheral surface of the top plate of the container on which the cooking container is placed, and the combustion gas is circulated. A cooking device having a concave combustion region having a circular shape, each flame hole being formed in a direction inclined at a predetermined angle from the radial direction to the circumferential side of the combustion region, so that the combustion gas is within the combustion region. The combustion gas exhaust passage for guiding the combustion gas downward and exhausting it to the outside of the combustion region is provided in the central portion of the combustion region.
According to a second aspect of the present invention, in the configuration of the first aspect, in order to favorably maintain the swirling of the combustion gas up to the central portion, a plurality of spirally-viewed planar views for guiding the swirling of the combustion gas are provided in the combustion region. Each of the guide plates is provided at such a height that the upper end is in contact with the bottom surface of the cooking container.
According to a third aspect of the present invention, in the configuration of the first or second aspect, in order to suppress energy waste, a part of the combustion gas that has reached the center of the combustion region is allowed to pass under the combustion region to be on the outer peripheral side. An annular flow path returning to the vicinity of the flame hole is provided.
According to a fourth aspect of the present invention, there is provided a mixed gas supply path for supplying a mixed gas of fuel gas and primary air to the flame hole in order to suppress a decrease in thermal efficiency. Further, it is characterized by being adjacent to at least one of the combustion region and the annular flow path.
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an exhaust fan for forcibly exhausting the combustion gas is provided in the combustion gas exhaust path in order to exhaust the combustion gas efficiently. It is a feature.

According to the first aspect of the present invention, by turning the combustion gas toward the center, the flow rate of the combustion gas increases and the heat transfer coefficient increases as it goes to the center. Therefore, the bottom surface of the cooking container can be heated uniformly, and an effective improvement in thermal efficiency can be expected.
According to the second aspect of the present invention, in addition to the effect of the first aspect, by adopting the guide plate, even if the turning on the center side may be weakened only by the turning vector from the flame hole, The swirling of the combustion gas can be suitably maintained up to the part.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the amount of heat that apparently passes through the lower space of the cooking container can be increased by adopting the annular flow path even if the flow velocity of the combustion gas is increased. , Energy waste can be reduced.
According to the fourth aspect of the present invention, in addition to the effect of any one of the first to third aspects, as a result of increasing the heat transfer rate to the bottom surface of the cooking vessel by increasing the flow velocity of the combustion gas, Even if the surface heat dissipation increases, the heat of the combustion gas is absorbed into the mixed gas, the flame temperature is increased, and the decrease in thermal efficiency can be suppressed.
According to the fifth aspect of the present invention, in addition to the effect of any one of the first to fourth aspects, the combustion gas can be concentrated in one place and forced exhaust can be efficiently performed. In addition, this concentrated exhaust facilitates monitoring of harmful components in the exhaust, recovery of drain from low-temperature combustion gas, and the like, and can quickly adjust the air-fuel ratio, stop operation when there is an abnormality, and the like.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of a gas stove which is an example of a heating cooker. The gas stove 1 is formed by forming a heating unit 4 and a heat exchanging unit 5 on the upper and lower sides of the body 2, respectively. A cylindrical body 6 is provided that passes through the heating unit 4 and the heat exchange unit 5 serving as a burner and accommodates the overheat prevention sensor 7.
First, the heating unit 4 is a flat disk-shaped space having a circular shape in plan view, and from the upper side, as a combustion region 10 and a circular flow channel, by a horizontal first partition plate 8 and a second partition plate 9 provided vertically inside. The recirculation region 11 and the upper mixed gas supply path 12 are partitioned. Of these, the uppermost combustion region 10 is lower than the top plate 3 of the vessel 2 and is closed by the bottom surface P1 when the cooking container P is placed. At this time, the overheat prevention sensor 7 is in contact with the bottom surface P1, and the cylinder 6 is close to the bottom surface P1.

  Further, the upper mixed gas supply path 12 rises on the outer periphery and communicates with the combustion region 10, and the boundary between the upper end of the rising portion 13 and the combustion region 10 is directed upward in the center as shown in FIG. An inclined flame hole plate 14 is provided. The flame hole plate 14 is inclined at a predetermined angle from the radial direction of the combustion region 10 to the circumferential direction side, and the inclined flame holes 15, 15, which eject the mixed gas supplied from the upper mixed gas supply path 12 in the circumferential direction.・ There are multiple protrusions at regular intervals. On the other hand, on the inner side of the combustion region 10, a cylindrical combustion gas exhaust passage 17 that extends downward and communicates with the combustion region 10 is formed by the outer tube 16 that is coaxially and non-contacted outside the cylindrical body 6. Yes.

  Further, the first partition plate 8 that partitions the combustion region 10 and the circulation region 11 is formed in a ring shape that is not in contact with the inner peripheral side of the rising portion 13 of the upper mixed gas supply path 12 and the outer peripheral side of the outer cylinder 16. The combustion region 10 and the circulation region 11 are in communication with each other between the inside of the flame hole plate 14 and the outside of the combustion gas exhaust passage 17. The upper surface of the first partition plate 8 is a spiral shape that guides the combustion gas generated by the combustion of the mixed gas in the inclined flame hole 15 along the ejection direction, and gradually guides it to the center as it advances in the circumferential direction. A plurality of upper guide plates 18, 18,. The upper guide plate 18 is formed at a height where the upper end coincides with the upper surface of the top plate 3, and also serves as a virtues for contacting and supporting the bottom surface P <b> 1 of the cooking container P. Further, between the first partition plate 8 and the second partition plate 9, there are provided lower guide plates 19, 19,... Which are paired with the upper guide plate 18 and whose turning directions are opposite to each other.

  In the heat exchanging section 5, the combustion gas exhaust passage 17 is formed so as to expand in the radial direction so that the radial cross section is meandering, and adjacent to the upper side of the combustion gas exhaust passage 17, The side mixed gas supply path 20 is also formed so that the radial cross section has a meandering shape. The inner peripheral side of the lower mixed gas supply path 20 rises along the outer periphery of the combustion gas exhaust path 17 and is connected to the inner peripheral side of the upper mixed gas supply path 12. Further, a mixing portion (not shown) is formed at the outer peripheral end of the lower mixed gas supply path 20, and fuel gas and an amount of primary air necessary for combustion are formed in the mixing portion by a nozzle (not shown) and an air supply fan 21. Are now supplied. Further, the combustion gas exhaust passage 17 is also connected to the exhaust fan 22 so that the combustion gas in the combustion region 10 can be forcibly exhausted to the outside through the combustion gas exhaust passage 17.

  In the gas stove 1 configured as described above, when an unillustrated ignition button provided on the front surface of the container body 2 is pressed, the fuel gas supply path is opened and fuel gas is supplied from the nozzle, and the air supply fan 21 Rotates and primary air is also supplied. This fuel gas and primary air become mixed gas in the mixing section and are supplied to the lower mixed gas supply path 20, and the lower mixed gas supply path 20 moves to the center side in a meandering manner and rises in the central section. The gas is supplied to the upper mixed gas supply path 12 of the heating unit 4 and then moves radially, and is ejected from each inclined flame hole 15 of the flame hole plate 14 through the rising part 13 along the circumferential direction. Here, the mixed gas is ignited by a continuous spark of a discharge electrode (not shown) whose tip protrudes in the vicinity of an arbitrary inclined flame hole 15, and a flame F is formed obliquely in the circumferential direction from the inclined flame hole 15. Therefore, the flames are formed in all the inclined flame holes 15 by sequentially transferring to the adjacent inclined flame holes 15.

  The combustion gas generated by this combustion is swirled and flows in the combustion region 10 in the circumferential direction, and is gradually guided toward the center of the combustion region 10 by the suction of the exhaust fan 23. In particular, since the spiral upper guide plate 18 is erected on the first partition plate 8, the combustion gas flows smoothly while maintaining the swirling flow without causing turbulent flow. The cooking container P is heated by the heat exchange between the swirling combustion gas and the bottom surface P1 of the cooking container P. Here, the flow rate increases as the distance from the center increases, and the heat transfer coefficient increases. Uniform heating can be performed on the bottom surface P1 of P.

  Combustion gas that has reached the center of the combustion region 10 descends through the combustion gas exhaust passage 17, but at this time, a part of the combustion gas does not flow to the combustion gas exhaust passage 17 and the first partition plate 8 and the outside. It flows into the circulation region 11 from the gap between the cylinder 16 and flows to the outer circumference side while turning along the lower guide plate 19 as it is in the circulation region 11, and from the gap between the first partition plate 8 and the rising portion 13. It merges into the combustion region 10 again. This makes it possible to maintain the amount of heat that apparently passes through the combustion region 10 even if the flow velocity on the center side increases. Further, the temperature of the mixed gas can be raised and the flame temperature can be raised by heat exchange between the combustion gas in the circulating region 11 across the second partition plate 9 and the mixed gas in the upper mixed gas supply path 12. Therefore, even if the flow rate is increased at the center of the combustion region 10 to increase the heat transfer coefficient, it is possible to suppress the surface heat radiation relative to the bottom surface P1 of the cooking vessel P and prevent the thermal efficiency from decreasing.

  On the other hand, the remaining combustion gas passes through the combustion gas exhaust passage 17 of the heat exchange unit 5 and is exhausted through the exhaust fan 22. Also at this time, since the temperature of the mixed gas can be raised by heat exchange with the mixed gas flowing through the lower mixed gas supply path 20, the waste heat is similar to the heat exchange between the circulating region 11 and the upper mixed gas supply path 12. The mixed gas can be preheated to improve the thermal efficiency.

Thus, according to the gas stove 1 of the said form, each inclination flame hole 15 provided in the internal peripheral surface of the combustion area | region 10 is formed in the direction which inclines by a predetermined angle from the radial direction of the combustion area | region 10 to the circumferential direction side, respectively. Thus, while the combustion gas is swirled in the combustion region 10 and flows to the center, the combustion gas exhaust path 17 that guides the combustion gas downward and discharges it to the outside of the combustion region 10 at the center of the combustion region 10. By providing, the flow rate of the combustion gas increases as it goes to the center, and the heat transfer rate increases. Therefore, the bottom face P1 of the cooking container P can be heated uniformly, and an effective improvement in thermal efficiency can be expected.
Particularly, here, a plurality of upper guide plates 18 having a spiral shape in a plan view for guiding the swirling of the combustion gas are provided in the combustion region 10 so that the upper ends thereof are in contact with the bottom surface P1 of the cooking container P. Even if only the swirl vector from the inclined flame hole 15 weakens the swirl at the center, the swirl of the combustion gas can be suitably maintained up to the center.

Further, by providing a circulation region 11 for returning a part of the combustion gas reaching the center of the combustion region 10 to the vicinity of the inclined flame hole 15 on the outer peripheral side through the lower part of the combustion region 10, the flow velocity of the combustion gas is provided. Even if the temperature rises, the amount of heat that apparently passes through the lower space of the cooking container P can be increased, and waste of energy can be suppressed.
Furthermore, as a result of increasing the flow rate of the combustion gas and increasing the heat transfer rate to the bottom surface P1 by making the upper mixed gas supply path 12 for supplying the mixed gas to the inclined flame hole 15 adjacent to the circulating region 11, Even if the surface heat radiation relative to the bottom surface P1 increases, the heat of the combustion gas is absorbed into the mixed gas to increase the flame temperature, thereby suppressing a decrease in thermal efficiency.
Further, by providing the exhaust fan 22 for forcibly exhausting the combustion gas in the combustion gas exhaust path 17, the exhaust gas can be efficiently exhausted by concentrating the combustion gas in one place. In addition, this concentrated exhaust facilitates monitoring of harmful components in the exhaust, recovery of drain from low-temperature combustion gas, and the like, and can quickly adjust the air-fuel ratio, stop operation when there is an abnormality, and the like.

In addition, the specific structure of the heating unit and the heat exchange unit is not limited to the above form. For example, in the combustion region, the flame hole plate serving as the inner peripheral surface is not inclined but oriented in the vertical direction, or the upper guide If the swirl flow of the combustion gas can be maintained only by the direction of the inclined flame holes, as well as changing the number and shape of the plates and lower guides, the upper guide plate is eliminated as shown in FIG. Further, protrusions 23, 23,... That contact the bottom surface P1 of the cooking container P may be provided. Further, the internal and external communication portions between the combustion region and the circulation region are not limited to the ring-shaped gap, and may be replaced with a slit or a through hole.
Furthermore, in the said form, although it has the structure where a combustion area | region is obstruct | occluded with a cooking container, as shown in FIG. 4, the bottom face P1 of the cooking container P is made high by making the height of the upper guide plate 18 or a protrusion. It is also possible to secure a combustion air by creating a gap between the combustion area 10 and the combustion area 10. Even if such a gap is generated, the swirling flow of the combustion gas and the exhaust at the center can be performed by the flame F formed inward from the inner peripheral surface of the combustion region 10.

On the other hand, the circulation channel is not a circulation region corresponding to substantially the entire surface of the combustion region as in the above embodiment, and a circulation passage through which combustion gas flows may be formed in a radial shape. Therefore, the contact aspect with the mixed gas supply path in a heating part can also consider adjoining a mixed gas supply path to a combustion area, or adjoining both a combustion area and an annular flow path.
In the heat exchanging section, it is possible to change the design such that the meandering of the combustion gas exhaust passage and the mixed gas supply passage is not up and down but left and right or both are formed in a spiral shape.

It is explanatory drawing of a gas stove. It is a perspective view of a heating part. It is a perspective view of the example of a change of a heating part. It is explanatory drawing of the example of a change of a gas stove.

Explanation of symbols

  1 ... Gas stove 2 ... Body 3 ... Top plate 4 ... Heating unit 5 ... Heat exchange part 8 ... First partition plate 9 ... Second partition plate 10 ... Combustion Area 11 .. recirculation area 12 .. upper mixed gas supply path 14.. Flame hole plate 15 .. inclined flame hole 17 .. combustion gas exhaust path 18 .. upper guide plate 19. Guide plate, 20 ... lower mixed gas supply path, 21 ... air supply fan, 22 ... exhaust fan, P ... cooking container, P1 ... bottom.

Claims (5)

On the top plate of the container on which the cooking container is placed, a cooking device having a plurality of flame holes on the inner peripheral surface and recessed in a circular combustion region in plan view through which the combustion gas is circulated,
Each flame hole is formed in a direction inclined at a predetermined angle from the radial direction to the circumferential direction side of the combustion region so that combustion gas flows to the center while swirling in the combustion region,
A cooking device according to claim 1, wherein a combustion gas exhaust passage is provided at a central portion of the combustion region to guide the combustion gas downward and exhaust the gas outside the combustion region.   2. The guide plate according to claim 1, wherein a plurality of spiral guide plates in a plan view for guiding the swirling of the combustion gas are provided in the combustion region at a height at which an upper end abuts against a bottom surface of the cooking vessel. Cooking cooker.   The annular flow path for returning a part of the combustion gas that has reached the center of the combustion region to the vicinity of the outer peripheral flame hole through the lower part of the combustion region is provided. Cooking cooker.   The mixed gas supply path for supplying a mixed gas of fuel gas and primary air to the flame hole is adjacent to at least one of the combustion region and the annular flow path. The cooking device described.   The cooking device according to any one of claims 1 to 4, wherein an exhaust fan for forcibly exhausting the combustion gas is provided in the combustion gas exhaust passage.

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